Maybe the acne was a part of it, i don't know, but when he first tried to pick her up he was really over the top. He could have been the handsomest guy in the world but it was too much.
He acted like a freak when he had the acne, and he acted cool when he didn't. I'm sure if he acted confident and not weird trying to look at her butt when he had acne she would have reacted differently.
It's a video on theories of why we get acne. The last one is my favorite